对其中536例孕妇在孕14 ~ 28周使用超声多普勒检测其脐动脉血流，并追踪其妊娠结局。
Among them, 536 cases were measured the umbilical artery index with color ultrasound Doppler during 14 to 28 weeks. In the end, the pregnancy outcome was record and analyzed.
这就是所谓的“妊娠代孕”，之所以受到青睐，是因为在一些州按这个程序怀胎的代理孕妇对生下来的婴儿没有任何法律权利。
This is called gestational surrogacy and is favored because in some states it gives the carrier no legal rights to the child she gives birth to.
大约每20个男人和更年期妇女中有一个会受到影响，在孕妇和待孕的尤其是那些偏胖的人中更常见。
Affecting around one in 20 men and post-menopausal women, it's more common in pregnant women and those who are still having periods, especially if they are heavy.
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